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Allowance for Credit Losses - Loans - Commercial and commercial real estate loan portfolios (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]            
Total loans   $ 1,055,683   $ 1,055,683   $ 1,067,949
Current period gross charge-offs, Total $ 2,800 7 $ 204 3,088 $ 620  
Other commercial real estate (non-owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
Total loans   236,352   236,352   233,882
Current period gross charge-offs, Total       2,762    
Commercial Portfolio Segment            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   59,156   59,156   110,142
2024/2023   101,497   101,497   137,086
2023/2022   131,869   131,869   101,631
2022/2021   85,558   85,558   113,330
2021/2020   109,619   109,619   65,020
Prior   217,188   217,188   192,032
Revolving Loans Amortized Cost Basis   58,475   58,475   60,995
Revolving Loans Converted to Term   8,135   8,135   1,992
Total loans   771,497   771,497   782,228
Current period gross charge-offs, 2023/2022           427
Current period gross charge-offs, 2022/2021       200    
Current period gross charge-offs, Prior       2,762   1,571
Current period gross charge-offs, Total       2,962   1,998
Commercial Portfolio Segment | Commercial real estate (owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   7,082   7,082   10,294
2024/2023   10,387   10,387   17,016
2023/2022   16,677   16,677   6,648
2022/2021   6,275   6,275   14,355
2021/2020   13,326   13,326   10,476
Prior   34,128   34,128   26,984
Revolving Loans Amortized Cost Basis   606   606   324
Revolving Loans Converted to Term           856
Total loans   88,481   88,481   86,953
Commercial Portfolio Segment | Commercial and industrial            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   13,466   13,466   16,714
2024/2023   11,049   11,049   19,837
2023/2022   15,373   15,373   21,386
2022/2021   14,135   14,135   9,150
2021/2020   7,507   7,507   4,568
Prior   20,258   20,258   19,969
Revolving Loans Amortized Cost Basis   50,438   50,438   55,627
Revolving Loans Converted to Term   8,135   8,135    
Total loans   140,361   140,361   147,251
Current period gross charge-offs, 2023/2022           427
Current period gross charge-offs, 2022/2021       200    
Current period gross charge-offs, Total     $ 132 200 $ 424 427
Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - retail            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   17,126   17,126   29,349
2024/2023   24,593   24,593   38,912
2023/2022   37,473   37,473   21,240
2022/2021   19,518   19,518   31,934
2021/2020   31,017   31,017   21,322
Prior   50,791   50,791   38,047
Revolving Loans Amortized Cost Basis   31   31   32
Revolving Loans Converted to Term           942
Total loans   180,549   180,549   181,778
Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - multi-family            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   136   136   25,984
2024/2023   28,047   28,047   28,807
2023/2022   31,859   31,859   16,423
2022/2021   11,636   11,636   16,816
2021/2020   16,396   16,396   12,428
Prior   37,205   37,205   31,431
Revolving Loans Amortized Cost Basis   475   475   475
Total loans   125,754   125,754   132,364
Commercial Portfolio Segment | Other commercial real estate (non-owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   21,346   21,346   27,801
2024/2023   27,421   27,421   32,514
2023/2022   30,487   30,487   35,934
2022/2021   33,994   33,994   41,075
2021/2020   41,373   41,373   16,226
Prior   74,806   74,806   75,601
Revolving Loans Amortized Cost Basis   6,925   6,925   4,537
Revolving Loans Converted to Term           194
Total loans   236,352   236,352   233,882
Current period gross charge-offs, Prior       2,762   1,571
Current period gross charge-offs, Total       2,762   1,571
Pass | Commercial Portfolio Segment            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   59,156   59,156   110,142
2024/2023   101,497   101,497   136,606
2023/2022   131,263   131,263   100,348
2022/2021   83,257   83,257   107,698
2021/2020   103,979   103,979   64,105
Prior   199,091   199,091   175,405
Revolving Loans Amortized Cost Basis   56,004   56,004   59,823
Revolving Loans Converted to Term   8,110   8,110   1,992
Total loans   742,357   742,357   756,119
Pass | Commercial Portfolio Segment | Commercial real estate (owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   7,082   7,082   10,294
2024/2023   10,387   10,387   17,016
2023/2022   16,677   16,677   6,648
2022/2021   6,275   6,275   10,675
2021/2020   9,648   9,648   10,476
Prior   33,063   33,063   26,393
Revolving Loans Amortized Cost Basis   457   457   324
Revolving Loans Converted to Term           856
Total loans   83,589   83,589   82,682
Pass | Commercial Portfolio Segment | Commercial and industrial            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   13,466   13,466   16,714
2024/2023   11,049   11,049   19,357
2023/2022   15,373   15,373   20,977
2022/2021   13,878   13,878   7,397
2021/2020   5,744   5,744   4,568
Prior   19,369   19,369   19,280
Revolving Loans Amortized Cost Basis   48,116   48,116   54,455
Revolving Loans Converted to Term   8,110   8,110    
Total loans   135,105   135,105   142,748
Pass | Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - retail            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   17,126   17,126   29,349
2024/2023   24,593   24,593   38,912
2023/2022   36,867   36,867   20,935
2022/2021   19,518   19,518   31,934
2021/2020   31,017   31,017   21,322
Prior   50,791   50,791   38,047
Revolving Loans Amortized Cost Basis   31   31   32
Revolving Loans Converted to Term           942
Total loans   179,943   179,943   181,473
Pass | Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - multi-family            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   136   136   25,984
2024/2023   28,047   28,047   28,807
2023/2022   31,859   31,859   16,423
2022/2021   11,636   11,636   16,816
2021/2020   16,396   16,396   11,513
Prior   34,987   34,987   30,066
Revolving Loans Amortized Cost Basis   475   475   475
Total loans   123,536   123,536   130,084
Pass | Commercial Portfolio Segment | Other commercial real estate (non-owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2025/2024   21,346   21,346   27,801
2024/2023   27,421   27,421   32,514
2023/2022   30,487   30,487   35,365
2022/2021   31,950   31,950   40,876
2021/2020   41,174   41,174   16,226
Prior   60,881   60,881   61,619
Revolving Loans Amortized Cost Basis   6,925   6,925   4,537
Revolving Loans Converted to Term           194
Total loans   220,184   220,184   219,132
Special Mention | Commercial Portfolio Segment            
Financing Receivable, Credit Quality Indicator [Line Items]            
2023/2022           305
2022/2021   1,857   1,857    
Prior   6,873   6,873   3,488
Revolving Loans Amortized Cost Basis   1,332   1,332    
Total loans   10,062   10,062   3,793
Special Mention | Commercial Portfolio Segment | Commercial real estate (owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
Prior   534   534    
Revolving Loans Amortized Cost Basis   149   149    
Total loans   683   683    
Special Mention | Commercial Portfolio Segment | Commercial and industrial            
Financing Receivable, Credit Quality Indicator [Line Items]            
Revolving Loans Amortized Cost Basis   1,183   1,183    
Total loans   1,183   1,183    
Special Mention | Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - retail            
Financing Receivable, Credit Quality Indicator [Line Items]            
2023/2022           305
Total loans           305
Special Mention | Commercial Portfolio Segment | Other commercial real estate (non-owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2022/2021   1,857   1,857    
Prior   6,339   6,339   3,488
Total loans   8,196   8,196   3,488
Substandard | Commercial Portfolio Segment            
Financing Receivable, Credit Quality Indicator [Line Items]            
2024/2023           480
2023/2022   606   606   978
2022/2021   444   444   5,632
2021/2020   5,640   5,640   915
Prior   10,826   10,826   13,139
Revolving Loans Amortized Cost Basis   1,139   1,139   1,172
Revolving Loans Converted to Term   25   25    
Total loans   18,680   18,680   22,316
Substandard | Commercial Portfolio Segment | Commercial real estate (owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2022/2021           3,680
2021/2020   3,678   3,678    
Prior   531   531   591
Total loans   4,209   4,209   4,271
Substandard | Commercial Portfolio Segment | Commercial and industrial            
Financing Receivable, Credit Quality Indicator [Line Items]            
2024/2023           480
2023/2022           409
2022/2021   257   257   1,753
2021/2020   1,763   1,763    
Prior   491   491   689
Revolving Loans Amortized Cost Basis   1,139   1,139   1,172
Revolving Loans Converted to Term   25   25    
Total loans   3,675   3,675   4,503
Substandard | Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - retail            
Financing Receivable, Credit Quality Indicator [Line Items]            
2023/2022   606   606    
Total loans   606   606    
Substandard | Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - multi-family            
Financing Receivable, Credit Quality Indicator [Line Items]            
2021/2020           915
Prior   2,218   2,218   1,365
Total loans   2,218   2,218   2,280
Substandard | Commercial Portfolio Segment | Other commercial real estate (non-owner occupied)            
Financing Receivable, Credit Quality Indicator [Line Items]            
2023/2022           569
2022/2021   187   187   199
2021/2020   199   199    
Prior   7,586   7,586   10,494
Total loans   7,972   7,972   $ 11,262
Doubtful | Commercial Portfolio Segment            
Financing Receivable, Credit Quality Indicator [Line Items]            
Prior   398   398    
Total loans   398   398    
Doubtful | Commercial Portfolio Segment | Commercial and industrial            
Financing Receivable, Credit Quality Indicator [Line Items]            
Prior   398   398    
Total loans   $ 398   $ 398